0.812 in
A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 6220-01-239-9889
NSN 6320-00-242-3300
NSN 6610-01-296-2104
NSN 5935-00-729-5559
NSN 6320-01-370-5222
NSN 5920-00-644-3285
NSN 5998-00-993-6806
NSN 5990-01-623-0082
NSN 5960-01-488-5817
NSN 6135-01-416-8342
NSN 4140-00-142-2491
NSN 5960-01-119-1288